An isosceles triangle has 2 equal sides and 1 side different in length
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Only if the triangle is degenerate.
No, those are two different types of triangles. An isosceles triangle has two sides of the same length and one side of different length; a scalene triangle has three sides which are all of different length.
An isosceles triangle has two sides that are equal length, and the other side would be a different length. A right triangle could be an isosceles triangle. On the other hand, a scalene triangle has all of its sides different lengths.
Perimeter of a triangle = (length of side #1) + (length of side #2) + (length of side #3)
-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.